具有限流指示功能的双通道电源开关Dual Power-Distribution Switch with Fault-Blanking CXUS7744是一种双通道的电源开关芯片，内部集成了两个95mΩ 的P型MOSFET功率管，每个通道各有一个逻辑使能控制信号。当负载超出限制范围或者有短路情况发生的时候，芯片会进入限流模式，把负载电流控制在安全区域内，同时拉低限流指示信号OCB(s)

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     CXUS7744是一种双通道的电源开关芯片，内部集成了两个95mΩ 的P型MOSFET功率管，每个通道各有一个逻辑使能控制信号。当负载超出限制范围或者有短路情况发生的时候，芯片会进入限流模式，把负载电流控制在安全区域内，同时拉低限流指示信号OCB(s)，CXUS7744的每个通道的限流电流设置典型值均在1A，并且具有fold back功能；如果持续存在超重负载或者短路情况，芯片内部温度和功耗将迅速上升，芯片将检测到过温状况，并自动进入保护状态，切断功率通道以防止芯片损毁；另外，CXUS7744还具有检测输入电源的功能，功率管会维持关断直到电源电压超过欠压阈值范围。OCB(s)是具有开漏输出的限流标记引脚，8ms的延时功能可以屏蔽错误的限流信号，防止芯片向主机系统发出错误的指示。例如大电容负载接入导致的短期限流情况的发生。CXUS7744可以在芯片关断的时候阻断反向电流的发生。CXUS7744封装采用8引脚的SOP封装，工作温度范围是(-40℃to +85℃)。The CXUS7744 incorporates dual 95mΩ P-channel MOSFET power switches for power-distribution systems that require multiple power switches in a single package. Each switch is controlled by a logic enable input. When either output load exceeds the current-limit threshold or a short is present, the device limits the outputs current to a safe level by switching into a constant-current limit mode with fold back, pulling the over-current (OCB(s)) logic output low. When continuous heavy overloads or short-circuits increase the power dissipation in the switches, causing the junction temperature to raise, a thermal protection circuit shutdown the switches to prevent damage. Internal Under Voltage Lock-Out (UVLO) circuitry ensures that the switches remain off until valid input voltage is present. Each power switch is designed to set current limit at 1A typically. OCB(s) are open-drain outputs which are asserted when over-current occurs. A 8ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms to the host system. The CXUS7744 eliminates any reversed current flow across each switch when it is powered off. The ECXUS7744is available in 8-pin SOP package, operates over the extended (-40 to ℃ +85 ) temperature ℃ range.

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• 双通道95 mΩ High-Side MOSFETpM7嘉泰姆

• 1A限流电流，且具有fold-back功能pM7嘉泰姆

• 工作电压范围:2.7V to 5.5VpM7嘉泰姆

• 300μs 输出电压上升时间pM7嘉泰姆

• 欠压保护功能pM7嘉泰姆

• 15μA 静态电流</p>

• 1μA 关断电流pM7嘉泰姆

• 低电平逻辑使能控制pM7嘉泰姆

• 芯片关断后没有反向电流</p>

• 具有延时功能的开漏输出限流指示信号</p>

• SOP-8,SOP-8(EP)封装pM7嘉泰姆

• 符合RoHS规范及Pb-FreepM7嘉泰姆

Dual 95m
High-Side MOSFETpM7嘉泰姆

1A (CXUS7744) Current Limits with Fold-backpM7嘉泰姆

1.5A (CXUS7744-15) Current Limits withpM7嘉泰姆

Fold-backpM7嘉泰姆

Operating Range:2.7V to 5.5VpM7嘉泰姆

300μS Typical Rise TimepM7嘉泰姆

Under voltage LockoutpM7嘉泰姆

15μA Quiescent Supply CurrentpM7嘉泰姆

1μA Shutdown Supply CurrentpM7嘉泰姆

Logic Level Enable Pin, Available withpM7嘉泰姆

Active-Low VersionpM7嘉泰姆

No Reverse Current when Power OffpM7嘉泰姆

Open-Drain Over-Current Flag Outputs withpM7嘉泰姆

fault-blankingpM7嘉泰姆

Available in SOP-8 and SOP-8 (EP) PackagespM7嘉泰姆

RoHS Compliant and 100% Lead(Pb)-FreepM7嘉泰姆

Halogen-FreepM7嘉泰姆

   应用范围 返回TOPpM7嘉泰姆

pM7嘉泰姆

• High-Side 电源开关</p>

• USB 电源管理系统pM7嘉泰姆

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• USB总线供电系统pM7嘉泰姆

• 热插拔电源分配系统</p>

• 电池充电系统pM7嘉泰姆

• 短路保护系统pM7嘉泰姆

High-Side Power Protection SwitchpM7嘉泰姆

USB Power ManagementpM7嘉泰姆

USB Host and Self-Powered BubspM7嘉泰姆

USB Bus-Powered HubspM7嘉泰姆

Hot Plug-In Power SuppliespM7嘉泰姆

Battery-Charger CircuitspM7嘉泰姆

Short-Circuit ProtectionspM7嘉泰姆

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